INVESTIGATION OF PULP PAPER CHARACTERISTIC OF THREE POPLAR COLONS, P.NIGRA, 69/55, 144/9 DELTOIDS, ORAMERICAN 214SaeidMehrabiSAGHEH CELLULOSE FACTORY TAKESTAN INDUSTRIAL AREAauthortextarticle2005perPoplar trees are classified as a fast growth trees and because of short rotation period, and suitable technical properties, are considered by pulp and paper making industries. In this study, physical and anatomical properties and pulp and paper of three colons of poplar trees, populous Alba. L. colon 44.9, populous deltoids 69.55, and populous euramerican are investigated. The average fiber length of these three colons were 0.854, 1.148, 1.08 mm. respectively and their average dry specific gravity were 0.386, 0461, and 0.341 g/cm3, and also their average cellulose content were 50.5, 51.5, and 49.5 percent.For Kraft process cooking of the mentioned colons, three cooking time, 1, 2, and 3 hours, 17°C cooking heat, 25% sulfidity, and active alkali at 3 levels, 15, 17.5, and 20% were used. The results show that p. alba, colon 44.9, and p. deltoids colon 69.55 with using 20% A.A and 3 hours cooking time have 53% yield and 18 kappa number.تحقیقات علوم چوب وکاغذ ایرانموسسه تحقیقات جنگلها و مراتع کشور1735-091320

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2005151168http://ijwpr.areeo.ac.ir/article_117580_369c1eefad7409eef739b0d58b2de165.pdfdx.doi.org/10.22092/ijwpr.2005.117580INVESTIGATION ON TENSILE STRENGTH OF DOWEL JOINT IN PARTICLEBOARD FASTENINGHabibNoriWOOD AND PAPER INDUSTRY, UNIVERSITY OF SHAHID RAJAEEIauthorAhmadJahan latibariProf. Islamic Azad University, Karaj, Iranauthormohammadghofranihead of the department of E-learningauthortextarticle2005perPoplar trees are classified as a fast growth trees and because of short rotation period, and suitable technical properties, are considered by pulp and paper making industries. In this study, physical and anatomical properties and pulp and paper of three colons of poplar trees, populous Alba. L. colon 44.9, populous deltoids 69.55, and populous euramerican are investigated. The average fiber length of these three colons were 0.854, 1.148, 1.08 mm. respectively and their average dry specific gravity were 0.386, 0461, and 0.341 g/cm3, and also their average cellulose content were 50.5, 51.5, and 49.5 percent.For Kraft process cooking of the mentioned colons, three cooking time, 1, 2, and 3 hours, 17°C cooking heat, 25% sulfidity, and active alkali at 3 levels, 15, 17.5, and 20% were used. The results show that p. alba, colon 44.9, and p. deltoids colon 69.55 with using 20% A.A and 3 hours cooking time have 53% yield and 18 kappa number.تحقیقات علوم چوب وکاغذ ایرانموسسه تحقیقات جنگلها و مراتع کشور1735-091320

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2005169184http://ijwpr.areeo.ac.ir/article_117581_8fa501935187f8a155743b09fe866eda.pdfdx.doi.org/10.22092/ijwpr.2005.117581INVESTIGATION ON SODA PULPING OF COTTON STALKSShamohammadAmirifaculty member. M.sc/Agriculture Research, Education and Extention and Organization. Agriculture and Natural Resources Research Center of Golestan Province.authortextarticle2005perAnatomical, chemical and pulping characteristics of Cotton stalk as a nonwood material.Fiber length, fiber diameter, lemun and cell wall thickness were measured at 24.47, 16.43 and 4.02 mn respectively. Paper making coefficients were also calculated coefficient, flexibility coefficient and ranckl coefficient were calculated at 34.28, 67.14 and 48.93 respectively.Chemical composition of cotton stalk was determined at 47.83%cellulose, 21.66% lignin, 2.13% alcohol-acetone extractives and 2.83% ash.Soda pulping at following variables was investigated. Three levels, of cooking temperature (140, 160 and 180 degree Celsius), three cooking time (30, 40 and 50 minutes) and raw material condition (normal and debarked stalks). Active alkali of 20% (based on NaOH) and liquor to wood ratio of 5: 1 were kept constant for all soda cooks. The optimum combination of variables160 degree Celsius I temperature, 40 minutes time and debarked raw material. The yield and kappa no. of pulp obtained at this cooking condition was 50.4% and 89.15 respectively.تحقیقات علوم چوب وکاغذ ایرانموسسه تحقیقات جنگلها و مراتع کشور1735-091320

2005207236http://ijwpr.areeo.ac.ir/article_117583_76db6746f4fe05843e763e8f5b09ae4d.pdfdx.doi.org/10.22092/ijwpr.2005.117583INVESTIGATION OF THE PRODUCTION CONDITION ON THE QUALITY OF PARTICLE BOARD MADE OF BAGASSESeyed JafarAlampoorRURAL INDUSTRIES DEPARTMENT MINISTRY OF AGRICULTURAL JAHAD TEHRAN, IRANauthortextarticle2005perIn this study, in order to gain the best Particleboard made of production, the effect of three factors, resin content, hardener content, and press time on the static bending strength, Internal board, water absorption, and thickness swelling after 2, and 24 hrs. Immersion in water of boards mades are studied. 54 boards were made and after measuring of their physical and mechanical, the results was analyzed with using the factorial completely randomize design.The results show that increasing resin content causes better quality of properties of boards such as bending strength, Internal bound, and dimensional stability.Increasing of press time from 5 to 5.5 min. Causes better bending strength, Internal board and dimensional stability of boards where, with increasing of press time from 5.5 to 6 min are observed that all of the mechanical properties of boards were reduced.Totally speaking, it can be noted that changing of bending properties, internal bound, water absorption, and thickness swelling after 2, and 24 hrs. Immersion in water of boards made show that optimum condition are 11% resin, 2% hardener, and 5.5 min press time for making particle board made of Bagasse. تحقیقات علوم چوب وکاغذ ایرانموسسه تحقیقات جنگلها و مراتع کشور1735-091320

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2005237254http://ijwpr.areeo.ac.ir/article_117584_73145304d1b1b6a8c97fa4bccf242d44.pdfdx.doi.org/10.22092/ijwpr.2005.117584A STUDY ON THE LONG TERM WATER ABSORPTION AND THICKNESS SWELLING BEHAVIOR OF WOOD-PLASTIC COMPOSITE PANELSMajidChahar mahalNATURAL RESOURCES AND MARINE SCIENCES FACULTY, TARBIAT MODARRES UNIVERSITYauthorSaeidKazemi najafiNATURAL RESOURCES AND MARINE SCIENCES FACULTY, TARBIAT MODARRES UNIVERSITYauthorMehdiTajvidiwood and paper science and technology department, of natural Resources faculty,
university of Tehran. IRANauthorRezaHajihassaniWood and forest products division, Research Institute of Forests and Rangelands, Agricultural Research Education and Extension Organization (AREEO), Tehran, Iranauthortextarticle2005perWood -Plastic panels were made from high density polyethylene (as resin) and MDF waste and particleboard waste (as natural fiber) at 60, 70 and 80% by weight fiber loading. Density and dimensions of the panels were 1g/cm3and 35*35*1 cm, respectively. Physical properties of the panels including equilibrium moisture content, long term water uptake and thickness swelling behavior were studied.Results indicated that equilibrium moisture content, maximum water uptake and thickness swelling of wood plastic samples increased with the increase in fiber content from 60% to 80%. Moreover, samples with higher fiber content faster reach to saturation point. تحقیقات علوم چوب وکاغذ ایرانموسسه تحقیقات جنگلها و مراتع کشور1735-091320

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2005255270http://ijwpr.areeo.ac.ir/article_117585_14a53dc0a53635f4fd0a6285779284ad.pdfdx.doi.org/10.22092/ijwpr.2005.117585MECHANICAL PROPERTIES OF WOOD-PLASTIC COMPOSITE MADE FROM PARTICLEBOARD AND MDF WASTES AND POLYETHYLENE (HDPE) WASTESMajidChaharmahaliNATURAL RESOURCES AND MARINE SCIENCES FACULTY, TARBIAT MODARRES UNIVERSITYauthorSaeidKazeminajafiNATURAL RESOURCES AND MARINE SCIENCES FACULTY, TARBIAT MODARRES UNIVERSITYauthorMehdiTajvidiWood and paper science and technology department, of natural Resources faculty,
university of Tehran. IRANauthorMohammad aliPodineh poorNATURAL RESOURCES AND MARINE SCIENCES FACULTY, TARBIAT MODARRES UNIVERSITYauthortextarticle2005perThe possibility of producing wood-plastic panels using melt blend method was studied in this research and mechanical properties of the panels including flexural modulus, flexural strength, screw and nail withdrawal resistance, and impact strength were studied.Wood -Plastic panels were made from high density polyethylene (as resin) and MDF waste and particleboard waste (as natural fiber) at 60, 70 and 80% by weight fiber loading. Density and dimensions of the panels were 1g/cm3and 35*35*1 cm, respectively. Results indicated that the mechanical properties of the composites are strongly affected by the proportion of the wood flour and polymer in the material. Maximum values of flexural modulus of wood plastic panels were found at 70% fiber content in both methods. Flexural strength, screw and nail withdrawal resistance and impact strength of wood plastic composites reduced with the increase in fiber content from 60% to 80%.تحقیقات علوم چوب وکاغذ ایرانموسسه تحقیقات جنگلها و مراتع کشور1735-091320

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2005271284http://ijwpr.areeo.ac.ir/article_117586_34971355dbcd7aa21942706cf4c02a95.pdfdx.doi.org/10.22092/ijwpr.2005.117586A STUDY ON DENSITY PROFILE OF THREE TYPES OF MEDIUM DENSITY FIBERBAORD (MDF) USED IN IRAN MARKETSaeidKazemi najafiFACULTY OF NATURAL RESOURCES, TARBIAT MODARRES UNIVERSITYauthorAliShalbafanFACULTY OF NATURAL RESOURCES, TARBIAT MODARRES UNIVERSITYauthorMajidCharmahaliدانشکده منابع طبیعی و علوم دریایی، دانشگاه تربیت مدرسauthortextarticle2005perDensity profile of three types of medium density fiberboard (MDF) panels used in Iran market was studied through direct method and gradually removing of layer. Modulus of elasticity, bending strength, internal bond, water absorption and thickness swelling were also determined. The results show that the shape of density profiles in all types of panels is nearly symmetric and normal, but the profil density in one was deeper, so it showed higher modulus elasticity and bending strength. No significant difference in internal bond was observed between different types of panels.تحقیقات علوم چوب وکاغذ ایرانموسسه تحقیقات جنگلها و مراتع کشور1735-091320